NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/10 A Output
SRBC-10F2Ax
•
•
•
•
•
•
•
Non-Isolated
High Efficiency
High Power Density
RoHS Compliant
•
•
•
•
•
•
•
Rev.A
Under-Voltage Lockout (UVLO)
Over Temperature Protection
Wide Input Range
Wide Trim Range
Remote On/Off
Converter Can Sink and Source
Current
Active Low/High (Option)
Fixed Frequency(300 kHz)
OCP/SCP
Flexible Output Voltage
Sequencing
Remote Sense
Description
The Bel SRBC-10F2Ax modules are a series of non-isolated dc/dc converters that deliver up to 10 A of output
current with full load efficiency of 95% at 3.3 Vdc output. These modules provide precisely regulated voltage
programmable via external resistor from 0.75 Vdc to 3.63 Vdc over a wide range of input voltage (2.4 Vdc - 5.5
Vdc). These modules have a sequencing feature that enables designers to implement various types of output
voltage sequencing when powering multiple voltages on a board. The open-frame construction and small
footprint enable designers to develop cost and space-efficient solutions. Standard features include remote On/Off,
remote sense, over current protection, short current protection, wide input, and programmable output voltage.
Part Selection
Output
Voltage
0.75 V - 3.63 V
1
Input
Voltage
2.4 V - 5.5 V
Max. Output
Current
10 A
Max. Output
Power
36.3 W
Typical
Efficiency
95%
Model Number
Active Low
SRBC-10F2AL
Model Number
Active High
SRBC-10F2A0
Notes:
1. These modules use a buck topology, so the output voltages must be 0.5 V less than the input voltage.
2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
3. Add “G” to the end of the Model Number to indicate Tray Packaging.
Absolute Maximum Ratings
Parameter
Input Voltage (continuous)
Output Enable Terminal Voltage
Sequencing Voltage
1
Min
-0.3 V
-0.3 V
-0.3 V
-40
°C
-55
°C
Typ
-
-
-
-
-
Max
5.8 V
5.8 V
Vin
85
°C
125
°C
Notes
Ambient Temperature
Storage Temperature
Notes:
All specifications are typical at 25
°C
unless otherwise stated.
1. SRBC-10F2Ax series of modules include a sequencing feature that enables users to implement
various types of output voltage sequencing in their applications. This is accomplished via an additional
sequencing pin. When the sequencing feature is not used, tie the SEQ pin to Vin or leave the SEQ pin
floating.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/10 A Output
Input Specifications
Parameter
Input Voltage
Input Current (full load)
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.75 V
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
2
Min
2.4 V
-
-
-
-
-
-
-
-
-
-
-
-
-
Typ
-
7.0 A
5.5 A
4.0 A
3.5 A
3.0 A
2.0 A
80 mA
15 mA
140 mA
40 mA
-
2.2 V
2.0 V
Max
5.5 V
8.0 A
9.5 A
9.0 A
7.5 A
6.0 A
4.0 A
-
-
-
-
0.2 A s
-
-
2
Notes
Vo, set
≤
Vin-0.5 V
Tested with two 100 uF/10 V tantalum
input capacitors & simulated source
impedance of 1uH, 5 Hz to 20 MHz.
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Output Specifications
Parameter
Output Voltage Set Point
Output Voltage Set Point
Load Regulation
Line Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current
Current Limit Threshold
Short Circuit Surge Transient
Ripple and Noise (pk-pk)
Ripple and Noise (rms)
Turn on Time
Overshoot at Turn on
Output Capacitance
ESR
≥
1m ohm
ESR
≥
10m ohm
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=3.3 V
-
-
-
-
130 mV
50 uS
150 mV
50 uS
-
-
-
-
di/dt=2.5 A/uS; Vin=5 V; and
with two 150 uF/16 V tantalum
capacitors & 1 uF/10 V ceramic
capacitor at the output
Min
-2% Vo,set
-3% Vo,set
-
-
-
0A
15 A
-
-
-
-
-
0 uF
0 uF
Typ
-
-
0.4% Vo,set
0.3% Vo,set
0.5% Vo,set
-
-
-
25 mV
8 mV
4 mS
0% Vo,set
-
-
Max
2% Vo,set
3% Vo,set
-
-
-
10 A
27 A
1.5 A s
50 mV
15 mV
8 mS
3% Vo,set
1000 uF
4700 uF
Tested with 0-20 MHz, 10 uF/
16 V tantalum capacitor &
1 uF/10 V TDK ceramic
capacitor at the output
2
Notes
Vin=5 V, lo=lomax full load
Over all operating input
voltages, resistive loads and
temperature conditions
Io=Iomin to Iomax
Vin=Vinmin to Vinmax
Tref=Tamin to Tamax
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/10 A Output
Output Specifications (continued)
Parameter
Transient Response
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
50% ~ 100% Max Load
Settling Time
100% ~ 50% Max Load
Settling Time
V
O
=0.75 V
V
O
=1.2 V
V
O
=1.5 V
V
O
=1.8 V
V
O
=2.5 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
130 mV
50 uS
130 mV
50 uS
120 mV
50 uS
120 mV
50 uS
120 mV
50 uS
120 mV
50 uS
130 mV
50 uS
130 mV
50 uS
120 mV
50 uS
140 mV
50 uS
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
di/dt=2.5 A/uS; Vin=5 V; and
with two 150 uF/16 V tantalum
capacitors & 1uF/10 V ceramic
capacitor at the output
Min
Typ
Max
Notes
Note:
All specifications are typical at nominal input (Vin=5 V), full load at 25
°C
unless otherwise stated.
General Specifications
Parameter
Efficiency
Vo=3.3 V
Vo=2.5 V
Vo=1.8 V
Vo=1.5 V
Vo=1.2 V
Vo=0.75 V
Switching Frequency
Over Temperature Shutdown
Output Trim Range (Wide Trim)
Remote Sense Compensation
MTBF
Dimensions
Inches (L
×
W
×
H)
Millimeters (L
×
W
×
H)
Weight
-
1.30 x 0.53 x 0.315
33.02 x 13.46 x 8.00
6.6 g
92%
90%
88%
87%
85%
79%
250 kHz
-
0.7525 V
-
95%
93%
91%
90%
88%
82%
300 kHz
125
°C
-
10%
6,643,156 hours
-
-
-
-
-
-
350 kHz
-
3.63 V
-
Measured at Vin=5 V, full load
Min
Typ
Max
Notes
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
°C)
-
Note:
All specifications are typical at 25
°C
unless otherwise stated.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/10 A Output
Control Specifications
Parameter
Signal Low (Unit Off)
Signal High (Unit On)
Signal Low (Unit On)
Signal High (Unit Off)
Sequencing Voltage
Sequencing Slew Rate Capability
Sequencing Delay Time
Tracking Accuracy
Power-Up
Power-Down
-
-
100 mV
200 mV
200 mV
400 mV
Min
-0.3 V
1.5 V
-0.3 V
1.5 V
0.05 V
-
10 mS
Typ
-
-
-
-
-
-
-
Max
0.3 V
5.8 V
0.3 V
5.8 V
Vin
2 V/mS
-
Delay from Vin, min to application of voltage
on SEQ pin
Notes
SRBC-10F2A0; Remote On/Off pin open, Unit
on.
SRBC-10F2AL; Remote On/Off pin open, Unit
on.
Sequencing Voltage should be higher than
output voltage.
Output Trim Equations
Equation for calculating the trim resistor (in kΩ) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up resistor should be connected between the Trim pin and Ground.
Vout
R
trim
=
21.07
−
5.11
V
adj
−
0.7525
Module
Trim
GND
Rtrim
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The
Trim Up voltage should be connected between the Trim pin and Ground.
V
trim
=
0.7
−
0.1698
×
(
V
adj
−
0.7525)
Module
Vout
Trim
Vtrim
GND
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
NON-ISOLATED DC/DC CONVERTERS
2.4 Vdc - 5.5 Vdc Input
0.75 Vdc - 3.63 Vdc/10 A Output
Efficiency Data
3.3V Vout
97.0%
95.0%
Efficiency
2.5V Vout
95.0%
Efficiency
90.0%
85.0%
80.0%
75.0%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
93.0%
91.0%
89.0%
87.0%
85.0%
4.5V
5.0V
5.5V
3.0V
3.3V
5.0V
5.5V
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Output Current (A)
Output Current (A)
Vo=3.3 V
1.8V Vout
Vo=2.5 V
1.5V Vout
95.0%
95.0%
90.0%
Efficiency
Efficiency
90.0%
85.0%
80.0%
75.0%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Output Current (A)
85.0%
80.0%
75.0%
70.0%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Output Current (A)
3.0V
3.3V
5.0V
5.5V
3.0V
3.3V
5.0V
5.5V
Vo=1.8 V
1.2V Vout
95.0%
90.0%
85.0%
Efficiency
80.0%
75.0%
70.0%
65.0%
60.0%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
Output Current (A)
Efficiency
90.0%
85.0%
80.0%
Vo=1.5 V
0.75V Vout
3.0V
3.3V
5.0V
5.5V
75.0%
70.0%
65.0%
60.0%
55.0%
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
3.0V
3.3V
5.0V
5.5V
10.0
Output Current (A)
Vo=1.2 V
Vo=0.7525 V
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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